I have seen an increasing number of people doing this recently. It involves adding a non-integer to the cl_cmdrate cvar, therefore corrupting the server's ping calculation and showing the client as having very low ping.

Announcing that a player is doing this, and removing all non-numeric characters from this cvar may be more preferable to a kick, due to the shear number of people doing it.

On a related note, it would be really useful if KAC exposed the function it uses to query clients cvars through an admin command. So that administrators could query a specific client for the value of an individual cvar.

--Asher
P.S: I'm writing this post at 6 AM as well, If you don't quite understand anything, just ask.

Well, unfortunately, at this time that would require a re-write of KAC related code since it is impossible to do dynamically allocated strings with what I currently have and would require me to move everything into SourceMod's ADT_Arrays.

As far as your ping-maskers since KAC only permits valid numbers in any convar it queries if they set it to non-numeric values KAC will boot them for "having a corrupted value" and they will be informed by KAC to restart their client.